:root {
    --primary-color: #005A9C; /* Xanh đậm Dalatmilk */
    --secondary-color: #00AEEF; /* Xanh nhạt Dalatmilk */
    --text-color: #333333; /* Xám đen */
    --bg-light: #FFFFFF;
    --bg-gray: #F8F9FA;
}
body {
    font-family: 'Be Vietnam Pro', sans-serif;
    margin: 0;
    background-color: var(--bg-light);
    color: var(--text-color);
    line-height: 1.6;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}
section {
    padding: 40px 0;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
h1, h2, h3 {
    color: var(--primary-color);
}

/* === HEADER & NAVIGATION === */
.header {
    background-color: var(--bg-light);
    border-bottom: 1px solid #eee;
    padding: 10px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}
.logo img.header-logo {
    height: 50px;
    width: auto;
    vertical-align: middle;
}
.main-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 25px;
}
.main-nav li {
    position: relative;
}
.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    display: block;
    padding: 10px 5px;
    white-space: nowrap;
}
.main-nav a:hover {
    color: var(--secondary-color);
}

/* === DROPDOWN MENU === */
.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-light);
    width: 1100px;
    max-width: 90vw;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.15);
    border-radius: 0 0 8px 8px;
    z-index: 101;
    padding: 25px 30px;
    border-top: 3px solid var(--secondary-color);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 30px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.main-nav li.dropdown:hover > .dropdown-content {
    display: grid;
    opacity: 1;
    visibility: visible;
}
.dropdown-content .column-title {
    font-size: 1.1em;
    margin-top: 0;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--secondary-color);
}
.dropdown-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: block;
}
.dropdown-content ul li { margin: 0; padding: 0; }
.dropdown-content ul li a {
    font-size: 0.9em;
    padding: 5px 0;
    white-space: normal;
}

/* === HERO BANNER & SECTIONS === */
.hero-section {
    padding: 0;
}
.hero-banner-img {
    width: 100%;
    display: block;
}
.intro, .features, .cta, .testimonials-section {
    text-align: center;
}
.intro h1 {
    font-size: 2.8em;
    margin-bottom: 15px;
}
.features, .testimonials-section {
    background-color: var(--bg-gray);
    border-radius: 15px;
    padding: 40px;
}
.features h2, .cta h2, .testimonials-section h2 { 
    font-size: 2.2em; 
    margin-bottom: 40px; 
}
.features-grid { 
    display: flex; 
    justify-content: space-around; 
    gap: 30px; 
    flex-wrap: wrap; 
}
.feature-item { 
    flex-basis: 30%; 
    min-width: 280px; 
}
.feature-item svg { 
    width: 60px; 
    height: 60px; 
    color: var(--primary-color); 
}
.feature-item h3 { 
    font-size: 1.4em; 
    margin: 15px 0; 
}
.cta { 
    background-color: var(--primary-color); 
    color: var(--bg-light); 
}
.cta h2, .cta p {
    color: var(--bg-light);
}

/* === BUTTONS === */
.cta-button { 
    display: inline-block; 
    background-color: var(--secondary-color); 
    color: var(--bg-light) !important; 
    padding: 15px 35px; 
    border-radius: 50px; 
    text-decoration: none; 
    font-weight: bold; 
    font-size: 1.1em; 
    transition: transform 0.2s, box-shadow 0.2s; 
}
.cta-button:hover { 
    transform: scale(1.05); 
    box-shadow: 0 4px 15px rgba(0,0,0,0.2); 
}

/* === SERVICE COMMITMENTS === */
.service-commitments {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
    padding-top: 30px;
    padding-bottom: 30px;
}
.service-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px;
}
.service-item svg {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    color: var(--primary-color);
}
.service-item h4 {
    margin: 0 0 5px 0;
    font-size: 1.1em;
    color: var(--primary-color);
}
.service-item p {
    margin: 0;
    font-size: 0.9em;
    color: #555;
}

/* === FEATURED PRODUCTS === */
.featured-products {
    background-color: var(--bg-light);
    text-align: center;
}
.featured-products h2 {
    font-size: 2.2em;
    margin-bottom: 40px;
}
.product-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 30px; 
}
.product-card { 
    border: 1px solid #eee; 
    border-radius: 8px; 
    overflow: hidden; 
    text-align: center; 
    padding: 20px; 
    transition: box-shadow 0.3s; 
    background-color: var(--bg-light);
    display: flex;
    flex-direction: column;
}
.product-card:hover { 
    box-shadow: 0 5px 20px rgba(0,0,0,0.1); 
}
.product-card img { 
    height: 200px; 
    width: 100%; 
    object-fit: contain; 
    margin-bottom: 15px; 
}
.product-card h3 { font-size: 1.2em; flex-grow: 1; }
.product-card p { margin-bottom: 20px; flex-grow: 1; color: #555; }
.product-card .cta-button {
    font-size: 0.9em;
    padding: 10px 25px;
}

/* === TESTIMONIALS SECTION === */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
    text-align: left;
}
.testimonial-card {
    background-color: var(--bg-light);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
}
.quote-icon {
    width: 40px;
    height: 40px;
    color: var(--secondary-color);
    opacity: 0.5;
    margin-bottom: 15px;
}
.testimonial-text {
    font-style: italic;
    color: #555;
    flex-grow: 1;
}
.testimonial-author {
    font-weight: bold;
    color: var(--primary-color);
    text-align: right;
    margin-top: 15px;
    font-style: normal;
}
.trustpilot-link-wrapper {
    margin-top: 30px;
    border-top: 1px solid #ddd;
    padding-top: 30px;
}
.trustpilot-link-wrapper p {
    margin-bottom: 15px;
    color: #555;
}

/* === FOOTER === */
.footer { 
    background-color: #2c3e50; 
    color: #ecf0f1; 
    padding: 40px 20px 10px 20px; 
    margin-top: 40px;
}
.footer-grid { 
    display: grid; 
    grid-template-columns: 2fr 1fr 1fr; 
    gap: 40px; 
    padding-bottom: 30px; 
    text-align: left; 
    max-width: 1100px;
    margin: 0 auto;
}
.footer-col h4 { 
    color: #FFFFFF; 
    margin-top: 0; 
    margin-bottom: 20px; 
    font-size: 1.2em; 
}
.footer-col p { 
    font-size: 0.95em; 
    line-height: 1.6; 
    margin-bottom: 10px; 
    color: #bdc3c7; 
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { 
    color: #bdc3c7; 
    text-decoration: none; 
    transition: color 0.2s; 
    font-size: 0.95em; 
}
.footer-col ul li a:hover { color: #FFFFFF; }
.footer-bottom { 
    text-align: center; 
    padding-top: 20px; 
    border-top: 1px solid #4a627a; 
    font-size: 0.9em; 
    color: #bdc3c7; 
    max-width: 1100px;
    margin: 0 auto;
}

/* === PAGE-SPECIFIC (LIEN-HE.HTML) === */
.contact-grid { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 40px; 
    align-items: center; 
}
.contact-info p { 
    font-size: 1.1em; 
}
.contact-info p strong { 
    color: var(--primary-color); 
}


/* === MOBILE RESPONSIVE STYLES === */
@media screen and (max-width: 992px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 5px 15px;
    }
    .main-nav a {
        font-size: 0.9em;
        padding: 8px;
    }
    .dropdown-content {
        display: none !important;
    }
    .intro h1, .features h2, .cta h2, .testimonials-section h2 {
        font-size: 2em;
    }
    .footer-grid, .contact-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}